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Hello all, I'm rather new to Houdini and this has left me scratching my head. My goal is to have a bunch of spheres moving up and down, as if they were bobbing on water. I've created a field of spheres by scattering some points onto a grid and then linking a sphere into a Copy Sop. I then stamped a variable called "bobbing" with this expression: rand($PT)*sin($F*10)/3. This makes some of my spheres move more than the others. My issue is that I can't manage to stop them from all starting this motion together and the sine curve kicks in for every one at the same time giving me the effect of a sound speaker playing. How do I get them to retain their current up-down animation while offsetting the start time? I've tried a ForEach SOP and also a Timeshift SOP but none of them worked and I'm stumped. I'd be grateful if you could offer any suggestions. I've attached the .hip file. bouncingBalls.hipnc